466350 - New Window Opens if tab is clicked on and mouse moved up

Status: RESOLVED DUPLICATE of bug 465184

(Firefox :: Tabbed Browser, defect)

Description

[Sebastian Pauka]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1b2pre) Gecko/20081120 Minefield/3.1b2pre (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1b2pre) Gecko/20081120 Minefield/3.1b2pre (.NET CLR 3.5.30729)

If you are using a multi tab session (i.e. more than one tab is open) and you click on a tab and then move the mouse up towards the top of the screen, the tab will jump to a new window. Im slightly confused as to whether this is a new function or a bug, because i cant find any option to disable it, and it oesnt seem to be documented anywhere. Its actually quite annoying when i select a tab and move the mouse to the address bar that it jumps out to another window. Thanks
S Pauka

Reproducible: Always

Steps to Reproduce:
1. Open multiple tabs.
2. Click on a tab
3. Rapidly move the mouse up to the top of the screen after clicking on a tab.
4. A new window will open with the tab
Actual Results:  
A new window opens with the contents of that tab.

Expected Results:  
No results.

Comment 1

[Sebastian Pauka]

After additional testing just now, it turns out that if the tab is dragged anywhere on or outside the window, apart from the tab pane, the tab opens in a new window. It seems that rapidly moving the mouse up seemed to fool it into thinking the mouse button was still pressed, at a guess, however, I still feel that this is a bug, as it does in many cases cause unexpected results.
Thanks
S Pauka

Comment 2

[Jesse Ruderman]

The new feature is from bug 225680.  It's definitely a bug if mouse movement after a click causes Firefox to treat the click as a drag.  But it's possible that's not what's happening, and you're just seeing bug 465346 / bug 465184.

Comment 3

[Damian Shaw [Quan]]

This seems like a duplicate, not of either bug 465346 or bug 465184, there doesn't seem to be anything special about moving the tab upwards. 

Trying many times, if you click and don't hold down then it doesn't detach the tab, I guess it depends how fast you are and how sensitive your mouse is. Because of bug 465184 you only have to drag the tab a single pixel at the moment, it's very easily accidentally done.

Comment 4

[Sebastian Pauka]

I guess that looks like it must be the answer.
Thanks

Comment 5

[Damian Shaw [Quan]]

Feel free to re-open this bug if after bug 465184 has been fixed you still get the problem.